Pneumatic tire core



Sept. 27, 1932.

C. E. LAWSON PNEUMATIC TIRE CORE Original Filed March 15, 1930 2 Sheets-Sheet Invenlor a 67 8/15? jiawa'on/ illllllllillllll'llllll By QM A llomey Sept. 27, 1932. c. E. LAWSON PNEUMATIC TIRE CORE Original Filed March 15, 1930 2 Sheets-Sheet Invenlor (hazar L. Ia Z0402 4/ A llomcy Patented Sept. 27, 1932 r UNITED STATES PATENT oFi-" cs i v jcesrnn L AwsonornrIo e, 011 10 I. i

Application ni qnmn 15; 1930', Serial No. 43s,107.- Renewed December 10, 1931.

This invention relates to new .and useful sections which are hingedly connected thereimprovements in pneumatic tire'cores of the to. g V general type V illustrated in Patent No. F1gure3 is a fragmentary view in eleva- 1,656,742, issued to me on January 17 ,"1928, tion looking at the inner side of the portions and has for oneof its objects to provide,in of the core'illustrated in Figure 2. r V r a manner as hereinafterset forth, a core of Figure 4 is a cross sectional view taken this character embodying a plurality of comsubstantially on the line 4- 1 of Figure'l. plementary sections which are hingedly con- Figure 5 is a cross-sectional view taken nected together and removable section wheresubstantiallyon the line 5 5 of Figure 1, by the core may be expeditiously mounted in and showing, in dotted lines, a'tire casing no position for use or removed from-the tire casand the complementary half sections. of a ing after the same has been molded. mold mounted thereon.

Another important object of the invention Figure 6 is an enlarged detail view in is to provide a core for use-in molding pneu perspective showing one of the expanding matic tire casings which is to take theplace elements constituting a partof this inven- 1e of the somewhat unsatisfactory ail bags iOnf y which are in widespread use at the present Figure 7 is an enlarged detail'view in for this purpose and'which will exerta uniperspective of one of the hinge leaves form pressure againstthe entire inner surthrough the medium of which certain of the H face of the tire casing during the'molding sections are connected together. 1 7cti U i p Referringto the .drawingsin detail, the Another important object of the invention reference character 1 "designates a plurality is to provide a pneumatic tire core of the ofarcuate hingedly connected core sections character set forth which embodies a novel and 2 designates a key or kick oiit section by construction and arrangement whereby the the removal of'which the hinged sections 1 use of but a single core is necessary throughmay be collapsed. .v I v out the molding process, thus facilitating the Each of thesections 1 and the section 2 construction of the tire and materially recomprises a rigid cap "3 of suitable metal ducing the cost of producing the same. 7 and substantially semi-circular in cross sec- '30 Further objects of the invention are to tion'having recessed longitudinal marginal 80,

provide a pneumatic tire core which will be portions in-which the upper marginal por simple in construction, strong, durable, eftionsof the sidewallsections 4 areslidably ficient in its use and which may be manufacseated. "As clearly seen in Figure '5 the sectured at low cost. Y tions 4 are curved in cross section and have All of the foregoing and still further obformed in egrally thereon the flat obtusely jects and advantages of the invention will g e 'fi ges 5 on the outer side of which 7 become apparent from a study of thefolloware n d the S g O hard l' ing specification, taken in connection with Onthe 1111191 slde. of Whlch Y6 mounted .40 the accompanying drawings wherein like the segments 8 of relatively soft metal. Sev pneumatic tire core constructed in accordsections and the end portions of the adjacent ginal flanges 13 which extend over the outer characters of reference designate corregi' the ,2 fii of t fiegments'ls sponding parts throughout the several views, rf fie id g gg s 5 1 g: gig ggg i and Wherem.: formed of spring-steel. I I J Figure -1 1s a view in side elevation of a I The sections- ,1 Of-the core are connected togetherthrough the medium of the hinge 51-1106 thls lnventlfnb the same 7 e g leaves 10 having the complementary eyes 11 shown in assembled positlon. thereon for'the reception of the headed pin- Elgure 2 a fragmentary Vlew 111 g tl'es 12. Eachof the hinge leaves 10 is pro tudinal section through one of the hinged vided with'the right angularly disposed marside of the adjacent end portions of the segments 7 on the flanges 5. Each of the flanges 13 is provided with holes 14 at spaced points therein and the holes through the opposite flanges of leaf are in alignment with each other. The flanges 5 and the segments 7, 8 and 9 of the side wall sections 4 of the core are slidably mounted on the pins 15 which extend transversely through the opposite end portions thereof and said pins are mounted in the opening 14 of the flanges 13. As illustrated to advantage in Figures 2 and 4 of the drawings, the segments 8 and 9 are provided, at a point intermediate the pins 15, with opposed sockets for the reception ofthe opposite end of a coil spring 16 which yieldingly urge the opposite side of the core outwardly into engagement with the retaining flanges 13 of the hinge leaves 10. Leaf spring members 17 are disposed between the segments 9 at intermediate portions of eachv of the sections 1 and the section 2 in a manner to yieldingly urge said intermediate portions outwardly.

The pins which connect the key or kickout 2 to the adjacent hinged sectionsl are removable to permit the ready removal of said kick-out section when it is desired to Collapse the core. In Figure 5 of the drawings, the reference numeral .18 designates a tire casing which is being molded on the core and 19 designates the complementary half sections of the mold, the tire casing and mold section being shown in dotted lines.

It will thus be seen that I have provided a pneumatic. tire core which will greatly facilitate the molding operation in building pneumatic tire casings. When removing the core from the casing, the knick-out section 2 is removed and the hinged sections 1 may then be folded inwardly and removed from the casing. The construction and arrangement of the rigid cap members 3 and the spring steel side wall sections 4, issuch that when the casing 18 has been built on the contracted core and placed in the mold sections 1 for the segments 7 and flanges 5 will move the sections 4 toward each other and thus cause the caps 3 to move outwardly to compress the casing against the mold. When the mold sections are removed, the spring elements 16 and 17 spread the sections 4 and permit retraction of the caps 3. It is understood that the mold sections 19 are recessed at the proper points to receive the hinges 10.

It is believed that'the many advantages of a pneumatic tire core constructed in accordance with this invention will be readiy understood, and although the preferred embodiment of theinvention is as illustrated and described, it is tobe understood that changes in the details of construction maybe had which will fall within the scope of the invention as claimed.

What is claimed is p 1. A pneumatic tire core of the character described comprising a plurality of hingedly connected sections and a removable section secured between certain of the hingedly connected sections in a manner to couple the same, all of said sections comprising a rigid outer peripheral cap of arcuate cross section and further including converging resilient side wall sections slidably engaged with the opposite longitudinal marginal portions of the cap and extending inwardly therefrom, and resilient means disposed between the inner portion of the side wall sections and adapted to yieldingly urge the same outward- 1y 2. A pneumatic tire core of the character described comprising a plurality of connected sections, each section including a rigid cap of substantially arcuate cross section, yieldable side wallsections slidably engaged with the longitudinal marginal portions of the cap and extending inwardly. therefrom in converging relation to each other, integral flanges extending inwardly from the side wall sections,-hinges secured to the flanges for pivotally connecting the sections together in a manner to permit lateral movement of the side wall sections,,flanges formed on the hinges adapted to limit the lateral movement of the sidewall sections in an outward direction and expansible springs disposed between the side wa'll'fianges in a manner to yieldingly urge the same outwardly. i

In testimony whereof I aflix my signature.

OAS TER E. LAWSON. 

